|
Mount Bandai (Bandai-san) is a stratovolcano located in Inawashiro-town, Bandai-town, and Kitashiobara village, in Yama-Gun, Fukushima prefecture. It is sometimes called “Aizu Fuji” and “Aizu Bandai” and is one of the hundred most famous mountains in Japan. It is an active stratovolcano located to the north of Lake Inawashiro. The altitude of a triangulation station “Bandai” installed in 1904 had been employed as the official altitude of Mount Bandai, but the station disappeared due to erosion, because of this it was re-measured in October 2010 and now is 1,816.29m. The name “Mount Bandai” is used to refer to the main peak “Bandai” and several other peaks including Akahani (1,430m) and Kushigamine (1,636m). Mount Bandai, including the Bandai heights, belongs to the Bandai Asahi national park. Mount Bandai was originally called “Iwahashi-yama” which means “a rock ladder to the sky.” The south foot is called Omotebandai and the north foot is called Urabandai. When seen from Omotebandai, the mountain looks very tidy, but when viewed from Urabandai the mountain shows a wild shape, due to its collapse. In 2007, the mountain was selected as one of the top 100 geographic landmarks in Japan. Additionally, in 2011 the mountain was certified as a geo park of Japan. == Volcanic activity == Typical features of mount Bandai’s activity are debris avalanches and sector collapses. We know this because evidence of this has been left in past activities. Mount Bandai has not experienced a lava flow after the eruption of about 10 000 years ago. Sediment surveys have shown us that the history of the volcano can be divided into 6 sections. It is thought that the volcanic activity period was from about 290,000 years ago when there were 2 scoria eruptions, after the activity of Mt. Nekoma (from approximately 1.1 million years ago to 350 thousand years ago) somewhere to the west. 1. It is not clear when the volcanic activities of Mount Bandai started, but it is believed that before about 290,000 years ago it was inactive and only became active after the activities of Nekoma volcano, which lies to the west, from 1.1 million years ago to 350,000 years ago. 2. Approximately 290,000 years ago, there were two scoria eruptions. 3. From about 210000 years to 200000 years ago there were several scoria and pumice eruptions. 4. Approximately 165,000 to 145,000 years ago, there were eruptions of volcanic ash and pumice. 5. From about 80,000 years ago to 65,000 years ago, there were sub-plinian and Vulcanian eruptions of pumice, which broke up the shape of the mountain. 6. Approximately 40,000 to 50,000 years ago, there was continuous activity with pumice eruptions, and sector collapse. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mount Bandai」の詳細全文を読む スポンサード リンク
|